17
3.6
External Switches and Indicators (CN31)
There are several external switches and indicators for
monitoring and controlling your CPU board. All the functions are
in the CN31 connector.
CN31 : External Switches and Indicators
PIN DESCRIPTION
PIN DESCRIPTION
1
+5V 2
Speaker
3
N/C 4 N/C
Power
LED
5
GND 6 N/C
7
N/C
8
+5V
Speaker
9
GND 10
Reset
Switch
11
GND 12 GND
Reset
button
13
IDE LED+
14
IDE LED-
•
CN29 : 2-pin Header ATX BUTTON Connector
PIN NO.
DESCRIPTION
1
ATX BUTTON
2 GND
•
CN30 : Backplane to Mainboard Connector
PIN NO.
DESCRIPTION
1 5VSB
2 ATX-ON
3 GND
★
Power source from Backplane with ATX Connector
(Through Power Button & +5VSB)
18
3.7
USB Port Connector (CN23, CN25)
The ROCKY- 3703EVR provide four built-in USB ports for the
future new I/O bus expansion.
CN23 / CN25
PIN NO. DESCRIPTION PIN NO. DESCRIPTION
1 VCC 8 VCC
2 DATA- 7 DATA-
3 DATA+ 6 DATA+
4 GROUND 5 GROUND
3.8
IrDA Infrared Interface Port (CN24)
The ROCKY-3703EVR has a built-in IrDA port which supports
Serial Infrared (SIR) or Amplitude Shift Keyed IR (ASKIR)
interface. If you want to use the IrDA port, you have to configure
SIR or ASKIR model in the BIOS under Peripheral Setup COM2.
Then the normal RS-232 COM 2 will be disabled.
•
CN24: IrDA connector
PIN NO.
DESCRIPTION
1 VCC
2 NC
3 IR-RX
4 Ground
5 IR-TX
6 NC
3.9
CPU & SYSTEM Fan Connector (CN1, CN22)
The ROCKY-3703EVR provides two CPU cooling fan
connectors, CN22 as well as a chassis fan connector, CN1.
These connectors can supply 12V/500mA to the cooling fan. All
connectors have the same pin assignments and provide a
"rotation" pin to get rotation signals from fans and notice the
system. So the system BIOS can recognize the fan speed.
Please note that only specified fan can issue the rotation signals.
•
CN1/CN22 : Fan Connector
PIN NO.
DESCRIPTION
1 Rotation
Signal
2 12V
3 Ground
